[Issue 19405] Speed up backwards UTF-8 decoding in stripRight & make nogc nothrow for strings

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19405

Nathan S. <n8sh.secondary at hotmail.com> changed:

           What    |Removed                     |Added
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            Summary|Improve backwards UTF-8     |Speed up backwards UTF-8
                   |decoding in stripRight &    |decoding in stripRight &
                   |make nogc nothrow for       |make nogc nothrow for
                   |strings                     |strings

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